Short answer: the PreSonus Eris Sub 8BT. It ranks #8 of 48 subwoofers by sound quality, rated 3.6/5, at $209.99; the Klipsch Flexus Sub 100 ranks #16, rated 3.4/5, and costs $279.99, so there is little reason to consider the other one.
The case for the PreSonus Eris Sub 8BT: Independent CEA-2010 testing records 77.7 dB at 20 Hz and 111.3 dB through 40-80 Hz. The catch: Warranty is a below-average 1 year.
The case for the Klipsch Flexus Sub 100: Independent CEA-2010 testing records 90.2 dB at 20 Hz and 109.1 dB (avg of 3/4 bands) through 40-80 Hz. Watch for: Only works with Klipsch Flexus soundbars, not as a standalone LFE sub.
Buy the PreSonus Eris Sub 8BT. It is rated higher for sound quality than the Klipsch Flexus Sub 100 and costs less, so only choose the other one for a particular feature it does better.
Still deciding? The full Subwoofers rankings cover every ranked option.
Specifications Side By Side
| PreSonus Eris Sub 8BT | Klipsch Flexus Sub 100 | |
|---|---|---|
| Price | $209.99 | $279.99 |
| Ranked | #8 of 48 in Small Home Subwoofers (Under 30 lbs) | #16 of 48 in Small Home Subwoofers (Under 30 lbs) |
| Enclosure | ported | sealed |
| Output SPL at 20 Hz | 77.7 dB | 90.2 dB |
| Output SPL at 25 Hz | 93.5 dB | 96.7 dB |
| Output SPL at 31.5 Hz | 99.6 dB | 101.2 dB |
| Output SPL at 40 Hz | 105.7 dB | 105.9 dB |
| Output SPL at 50 Hz | 109.4 dB | 109.0 dB |
| Output SPL at 63 Hz | 115.0 dB | 112.4 dB |
| Output SPL at 80 Hz | 115.3 dB | - |
| CEA-2010-A Average (40-80Hz) | 111.3 dB | 109.1 dB (avg of 3/4 bands) |
| Dimensions | 11.7”H x 9.8”W x 12.7”D (297.9 x 249.9 x 323.1 mm) | 13.4”H x 13.2”W x 13.7”D (339.9 x 335.0 x 349.2 mm) |
| Weight | 16.3 lbs (7.4 kg) | 20.7 lbs (9.4 kg) |
| Warranty | 1 | 2/5 |
| Measurement Source | Brent Butterworth | Brent Butterworth |
| Drivers | 8” (203mm) driver | 10” (254mm) driver |
| Country | China | - |
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Prices on this page were last checked September 29, 2026 at 3:43 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.
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The Two Speakers In Full
PreSonus Eris Sub 8BT: $209.99 Amazon eBay
Pros: Independent CEA-2010 testing records 77.7 dB at 20 Hz and 111.3 dB through 40-80 Hz. The ported enclosure with an 8” driver suits a small room or desktop-adjacent setup.
Cons: Warranty is a below-average 1 year. The 297.9H x 249.9W x 323.1D mm cabinet and 7.4 kg mass still need deliberate placement.
Full PreSonus Eris Sub 8BT review and specifications →
| CEA-2010-A Average (40-80Hz) | 111.3 dB |
|---|---|
| Country | China |
| Dimensions | 11.7”H x 9.8”W x 12.7”D (297.9 x 249.9 x 323.1 mm) |
| Drivers | 8” (203mm) driver |
| Enclosure | ported |
| Measurement Source | Brent Butterworth |
| Output SPL at 20 Hz | 77.7 dB |
| Output SPL at 25 Hz | 93.5 dB |
| Output SPL at 31.5 Hz | 99.6 dB |
| Output SPL at 40 Hz | 105.7 dB |
| Output SPL at 50 Hz | 109.4 dB |
| Output SPL at 63 Hz | 115.0 dB |
| Output SPL at 80 Hz | 115.3 dB |
| Warranty | 1 |
| Weight | 16.3 lbs (7.4 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Independently measured by Brent Butterworth; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons
Klipsch Flexus Sub 100: $279.99 Amazon eBay
Pros: Independent CEA-2010 testing records 90.2 dB at 20 Hz and 109.1 dB (avg of 3/4 bands) through 40-80 Hz. The sealed enclosure with a 10” driver suits a small room.
Cons: Only works with Klipsch Flexus soundbars, not as a standalone LFE sub. The 339.9H x 335.0W x 349.2D mm cabinet and 9.4 kg mass still need deliberate placement.
Full Klipsch Flexus Sub 100 review and specifications →
| CEA-2010-A Average (40-80Hz) | 109.1 dB (avg of 3/4 bands) |
|---|---|
| Dimensions | 13.4”H x 13.2”W x 13.7”D (339.9 x 335.0 x 349.2 mm) |
| Drivers | 10” (254mm) driver |
| Enclosure | sealed |
| Measurement Source | Brent Butterworth |
| Output SPL at 20 Hz | 90.2 dB |
| Output SPL at 25 Hz | 96.7 dB |
| Output SPL at 31.5 Hz | 101.2 dB |
| Output SPL at 40 Hz | 105.9 dB |
| Output SPL at 50 Hz | 109.0 dB |
| Output SPL at 63 Hz | 112.4 dB |
| Warranty | 2/5 |
| Weight | 20.7 lbs (9.4 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Independently measured by Brent Butterworth; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons
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